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“Wormholes” are cosmic tunnels that can connect two distant regions of the universe, and have been popularized by the dissemination of theoretical physics and by works of science fiction like Stargate, Star Trek or, more recently, Interstellar. Using present-day technology it would be impossible to create a gravitational wormhole, as the field would have to be manipulated with huge amounts of gravitational energy, which no one yet knows how to generate. In electromagnetism, however, advances in metamaterials and invisibility have allowed researchers to put forward several designs to achieve this.

For more than 50 years, we’ve been eavesdropping on the cosmos, searching for transmissions that would reveal the existence of intelligent, extraterrestrial life. Ironically, the idea of searching for ruined civilizations began at an academic workshop on “Building Habitable Worlds.”